Ian Grimes, M.D.
NPI 1275737165 · Gastroenterology Physician · Madison, WI
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ian Grimes, M.D. is a Gastroenterology Physician provider in Madison, WI (NPI 1275737165).
Provider details
- NPI number
- 1275737165
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 52636 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
358 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 90 | $229 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 88 | $99 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 35 | $15 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 32 | $87 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 32 | $61 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 20 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-C | 199 | 191 |
| Adalimumabbrand: Humira(cf) Pen | 93 | — |
| Mesalamine | 46 | 12 |
| Azathioprine | 46 | — |
| Pantoprazole Sodium | 35 | — |
| Diphenoxylate Hcl/Atropinebrand: Diphenoxylate-Atropine | 34 | 11 |
| Ustekinumabbrand: Stelara |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-06-13
- Last updated
- 2021-01-27
- Certified
- 2021-01-27
Frequently asked questions
- What is Ian Grimes's NPI number?
- Ian Grimes's National Provider Identifier (NPI) is 1275737165, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ian Grimes's specialty?
- Ian Grimes is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Ian Grimes located?
- Ian Grimes's practice location on file with NPPES is 750 University Row, Madison, WI 53705-1311.
- What is Ian Grimes's phone number?
- The practice phone number listed in the NPPES registry for Ian Grimes is (608) 890-5000.
- Does Ian Grimes accept Medicare?
- Ian Grimes is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ian Grimes's NPI active?
- Yes — Ian Grimes's NPI (1275737165) is active in the NPPES registry as of the last update on 2021-01-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.